Prepared sandstone sample

USDA Photo by: Ken Hammond
USDA Image Number: 93cs3955
Source: http://www.usda.gov/oc/photo/93cs3955.htm Archived here: https://web.archive.org/web/20060930021741/http://www.usda.gov/oc/photo/93cs3955.htm

This image or file is a work of a United States Department of Agriculture employee, taken or made as part of that person's official duties. As a work of the U.S. federal government , the image is in the public domain . English ∙ español ∙ Nederlands ∙ slovenščina ∙ Tiếng Việt ∙ македонски ∙ русский ∙ українська ∙ 日本語 ∙ +/−